18313289 has 2 divisors, whose sum is σ = 18313290. Its totient is φ = 18313288.

The previous prime is 18313277. The next prime is 18313303. The reversal of 18313289 is 98231381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17472400 + 840889 = 4180^2 + 917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18313289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18313259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9156644 + 9156645.

It is an arithmetic number, because the mean of its divisors is an integer number (9156645).

Almost surely, 2^18313289 is an apocalyptic number.

It is an amenable number.

18313289 is a deficient number, since it is larger than the sum of its proper divisors (1).

18313289 is an equidigital number, since it uses as much as digits as its factorization.

18313289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 35.

The square root of 18313289 is about 4279.4028789073. The cubic root of 18313289 is about 263.5858644997.

The spelling of 18313289 in words is "eighteen million, three hundred thirteen thousand, two hundred eighty-nine".